<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <!-- 破解保险箱 -->
    <script>
      var crackSafe = function (n, k) {
        highest = Math.pow(10, n - 1)
        let ans = ''
        const seen = new Set()
        const dfs = node => {
          for (let x = 0; x < k; ++x) {
            let nei = node * 10 + x
            if (!seen.has(nei)) {
              seen.add(nei)
              dfs(nei % highest)
              ans += x
            }
          }
        }

        dfs(0)
        for (let i = 1; i < n; i++) {
          ans += '0'
        }
        return ans
      }
      console.log(crackSafe(2, 2))
    </script>
  </body>
</html>
